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Posted to notifications@shardingsphere.apache.org by GitBox <gi...@apache.org> on 2021/06/09 07:30:43 UTC
[GitHub] [shardingsphere] ddx10000 opened a new issue #10732: SNOWFLAKE algorithm causes data skew.
ddx10000 opened a new issue #10732:
URL: https://github.com/apache/shardingsphere/issues/10732
## Bug Report
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### Which version of ShardingSphere did you use?
5.0.0-RC1-SNAPSHOT
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere-JDBC
### Expected behavior
The order_id and order_item_id should include odd and even numbers respectively. But all order_id is even number and all order_item_id is odd number.
### Actual behavior
---------------------------- Print Order Data -----------------------
order_id: 609400984137347072, user_id: 1, address_id: 1, status: INSERT_TEST_JPA
order_id: 609400984552583168, user_id: 2, address_id: 2, status: INSERT_TEST_JPA
order_id: 609400984581943296, user_id: 3, address_id: 3, status: INSERT_TEST_JPA
order_id: 609400984607109120, user_id: 4, address_id: 4, status: INSERT_TEST_JPA
order_id: 609400984628080640, user_id: 5, address_id: 5, status: INSERT_TEST_JPA
order_id: 609400984644857856, user_id: 6, address_id: 6, status: INSERT_TEST_JPA
order_id: 609400984661635072, user_id: 7, address_id: 7, status: INSERT_TEST_JPA
order_id: 609400984682606592, user_id: 8, address_id: 8, status: INSERT_TEST_JPA
order_id: 609400984703578112, user_id: 9, address_id: 9, status: INSERT_TEST_JPA
order_id: 609400984724549632, user_id: 10, address_id: 10, status: INSERT_TEST_JPA
---------------------------- Print OrderItem Data -------------------
order_item_id:609400984498057217, order_id: 609400984137347072, user_id: 1, status: INSERT_TEST_JPA
order_item_id:609400984569360385, order_id: 609400984552583168, user_id: 2, status: INSERT_TEST_JPA
order_item_id:609400984594526209, order_id: 609400984581943296, user_id: 3, status: INSERT_TEST_JPA
order_item_id:609400984615497729, order_id: 609400984607109120, user_id: 4, status: INSERT_TEST_JPA
order_item_id:609400984636469249, order_id: 609400984628080640, user_id: 5, status: INSERT_TEST_JPA
order_item_id:609400984653246465, order_id: 609400984644857856, user_id: 6, status: INSERT_TEST_JPA
order_item_id:609400984674217985, order_id: 609400984661635072, user_id: 7, status: INSERT_TEST_JPA
order_item_id:609400984690995201, order_id: 609400984682606592, user_id: 8, status: INSERT_TEST_JPA
order_item_id:609400984711966721, order_id: 609400984703578112, user_id: 9, status: INSERT_TEST_JPA
order_item_id:609400984732938241, order_id: 609400984724549632, user_id: 10, status: INSERT_TEST_JPA
### Reason analyze (If you can)
SNOWFLAKE algorithm causes data skew.
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule configuration, when exception occur etc.
run org.apache.shardingsphere.example.sharding.spring.boot.jpa.ExampleMain#main
### Example codes for reproduce this issue (such as a github link).
application.properties:
spring.profiles.active=sharding-tables
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[GitHub] [shardingsphere] ddx10000 commented on issue #10732: SNOWFLAKE algorithm causes data skew.
Posted by GitBox <gi...@apache.org>.
ddx10000 commented on issue #10732:
URL: https://github.com/apache/shardingsphere/issues/10732#issuecomment-858221328
> The problem is fixed by 3.1.0.
>
> The version `5.0.0-RC1-SNAPSHOT` you reported is not existed, please double check.
>
> FYI: https://shardingsphere.apache.org/document/current/en/faq/#12-why-are-the-default-distributed-auto-augment-key-strategy-provided-by-shardingsphere-not-continuous-and-most-of-them-end-with-even-numbers
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[GitHub] [shardingsphere] RaigorJiang commented on issue #10732: SNOWFLAKE algorithm causes data skew.
Posted by GitBox <gi...@apache.org>.
RaigorJiang commented on issue #10732:
URL: https://github.com/apache/shardingsphere/issues/10732#issuecomment-924771356
Hi @ddx10000
The ID skew you see is not caused by the algorithm, but caused by the specific calling sequence.
We can adjust the code logic of the example later to make the primary key look more natural.
Thank you for your feedback.
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[GitHub] [shardingsphere] ddx10000 commented on issue #10732: SNOWFLAKE algorithm causes data skew.
Posted by GitBox <gi...@apache.org>.
ddx10000 commented on issue #10732:
URL: https://github.com/apache/shardingsphere/issues/10732#issuecomment-860619324
I had check FAQ, https://shardingsphere.apache.org/document/current/en/faq/#12-why-are-the-default-distributed-auto-augment-key-strategy-provided-by-shardingsphere-not-continuous-and-most-of-them-end-with-even-numbers, but it isn't the same issue.
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[GitHub] [shardingsphere] terrymanu commented on issue #10732: SNOWFLAKE algorithm causes data skew.
Posted by GitBox <gi...@apache.org>.
terrymanu commented on issue #10732:
URL: https://github.com/apache/shardingsphere/issues/10732#issuecomment-857662885
The problem is fixed by 3.1.0.
The version `5.0.0-RC1-SNAPSHOT` you reported is not existed, please double check.
FYI: https://shardingsphere.apache.org/document/current/en/faq/#12-why-are-the-default-distributed-auto-augment-key-strategy-provided-by-shardingsphere-not-continuous-and-most-of-them-end-with-even-numbers
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[GitHub] [shardingsphere] ddx10000 commented on issue #10732: SNOWFLAKE algorithm causes data skew.
Posted by GitBox <gi...@apache.org>.
ddx10000 commented on issue #10732:
URL: https://github.com/apache/shardingsphere/issues/10732#issuecomment-860619540
shardingsphere version: 5.0.0-RC1-SNAPSHOT
shardingsphere-example version: 5.0.0-alpha
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[GitHub] [shardingsphere] RaigorJiang commented on issue #10732: SNOWFLAKE algorithm causes data skew.
Posted by GitBox <gi...@apache.org>.
RaigorJiang commented on issue #10732:
URL: https://github.com/apache/shardingsphere/issues/10732#issuecomment-924791387
It is not a bug, we will close this issue.
If you are willing to improve the example, please submit another issue, thank you!
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[GitHub] [shardingsphere] ddx10000 closed issue #10732: SNOWFLAKE algorithm causes data skew.
Posted by GitBox <gi...@apache.org>.
ddx10000 closed issue #10732:
URL: https://github.com/apache/shardingsphere/issues/10732
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[GitHub] [shardingsphere] RaigorJiang closed issue #10732: SNOWFLAKE algorithm causes data skew.
Posted by GitBox <gi...@apache.org>.
RaigorJiang closed issue #10732:
URL: https://github.com/apache/shardingsphere/issues/10732
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